fix(awareness): show a 999.6 m contact marker as 1.0 km, not 1000 m

The on-globe Contacts markers picked metres before rounding, so a contact
999.5 m or more away read "1000 m" while the Contacts panel read
"1.0 km". The marker label now rounds first, as the panel does.

src/data/militaryAwarenessEngine.js

@@ -47,8 +47,10 @@ export function findByDoublingRadius(
 /** @param {number} meters @returns {string} */
 export function formatAwarenessDistance(meters) {
   if (!Number.isFinite(meters) || meters < 0) return '—';
-  return meters < 1000
-    ? `${Math.round(meters)} m`
+  // Round before the kilometre cut. 999.6 m was printed as "1000 m".
+  const wholeMeters = Math.round(meters);
+  return wholeMeters < 1000
+    ? `${wholeMeters} m`
     : `${(meters / 1000).toFixed(meters < 10000 ? 1 : 0)} km`;
 }
 

src/data/militaryAwarenessEngine.test.mjs

@@ -24,6 +24,12 @@ test('awareness formatters preserve valid zeroes and replace missing or invalid
   assert.equal(formatAwarenessLabel(undefined), '—');
 });
 
+test('a contact marker moves a distance that rounds to 1,000 m into kilometres', () => {
+  assert.equal(formatAwarenessDistance(999.4), '999 m');
+  assert.equal(formatAwarenessDistance(999.6), '1.0 km');
+  assert.equal(formatAwarenessDistance(4600), '4.6 km');
+});
+
 test('awareness cohorts sort nearest-first and do not turn empty data into out of range', () => {
   const result = summarizeAwarenessCohort([{ id: 'far', distance: 9000 }, { id: 'near', distanceM: 1000 }]);
   assert.equal(result.relationship, 'NEARBY');